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-rw-r--r--opentrack/timer.hpp68
1 files changed, 68 insertions, 0 deletions
diff --git a/opentrack/timer.hpp b/opentrack/timer.hpp
new file mode 100644
index 00000000..628365c9
--- /dev/null
+++ b/opentrack/timer.hpp
@@ -0,0 +1,68 @@
+#pragma once
+#include <ctime>
+#if defined (_WIN32)
+# include <windows.h>
+static inline void opentrack_clock_gettime(int, struct timespec* ts)
+{
+ static LARGE_INTEGER freq;
+
+ if (!freq.QuadPart)
+ (void) QueryPerformanceFrequency(&freq);
+
+ LARGE_INTEGER d;
+
+ (void) QueryPerformanceCounter(&d);
+
+ d.QuadPart *= 1000000000L;
+ d.QuadPart /= freq.QuadPart;
+
+ ts->tv_sec = d.QuadPart / 1000000000L;
+ ts->tv_nsec = d.QuadPart % 1000000000L;
+}
+# define clock_gettime opentrack_clock_gettime
+#else
+# if defined(__MACH__)
+# define CLOCK_MONOTONIC 0
+# include <inttypes.h>
+# include <mach/mach_time.h>
+static inline void clock_gettime(int, struct timespec* ts)
+{
+ static mach_timebase_info_data_t sTimebaseInfo;
+ uint64_t state, nsec;
+ if ( sTimebaseInfo.denom == 0 ) {
+ (void) mach_timebase_info(&sTimebaseInfo);
+ }
+ state = mach_absolute_time();
+ nsec = state * sTimebaseInfo.numer / sTimebaseInfo.denom;
+ ts->tv_sec = nsec / 1000000000L;
+ ts->tv_nsec = nsec % 1000000000L;
+}
+# endif
+#endif
+class Timer {
+private:
+ struct timespec state;
+ long conv(const struct timespec& cur)
+ {
+ return (cur.tv_sec - state.tv_sec) * 1000000000L + (cur.tv_nsec - state.tv_nsec);
+ }
+public:
+ Timer() {
+ start();
+ }
+ long start() {
+ struct timespec cur;
+ (void) clock_gettime(CLOCK_MONOTONIC, &cur);
+ long ret = conv(cur);
+ state = cur;
+ return ret;
+ }
+ long elapsed() {
+ struct timespec cur;
+ (void) clock_gettime(CLOCK_MONOTONIC, &cur);
+ return conv(cur);
+ }
+ long elapsed_ms() {
+ return elapsed() / 1000000L;
+ }
+};